package gx.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import gx.entity.Manager;

public class SecurityFilter implements Filter {

	@Override
	public void destroy() {
		
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest) req;
		HttpServletResponse response=(HttpServletResponse) res;
		
		HttpSession session=request.getSession();
		//从Session中取名为curr_mgr的对象
		Manager mgr=(Manager)session.getAttribute("curr_mgr");
		if(mgr!=null){
			chain.doFilter(request, response);
		}else if(mgr==null){
			session.setAttribute("msg", "后台操作，请先登录！");
			response.sendRedirect(request.getContextPath()+"/login.jsp");
		}
		
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
	}

}
